Abstract:

To explore the allelochemical components of sugar beet and reduce the side effects caused by continuous beet cropping, two treatments of fallow soil and continuous cropping soil for one year were set up to explore the effects of different soils on the germination rate, disease rate, plant height and stem thickness of sugar beet seedlings. Mass spectrometry (GC-MS) analysis technology was used, two kinds of soil compounds with significant differences (P<0.05) were initially screened. The results showed that: compared with fallow soil, the germination rate of beet seedlings planted in continuous soil was not significantly affected, but the chance of seedlings infected with blast disease was greatly increased and reached a significant level. In terms of plant height, leaf area and fresh weight above the ground, the difference between planting in fallow soil and planting in continuous soil was significant, but the difference in stem thickness was not significant (P＞0.05). Using mass spectrometry technology, 15 suspected sugar beet allelochemicals were obtained. The allelochemical components in continuous sugar beet cropping soil could have a certain impact on the growth of sugar beet seedlings. The screening and identification of suspected allelochemical components is of significance to alleviating the obstacles to continuous sugar beet cropping and improving the yield and quality of sugar beet.

Key words: sugar beet, allelochemicals, continuous cropping obstacles, GC-MS analysis, allelopathy, continuous cropping soil, fallow soil